EVCS Scheduled Charge Off-peak Tariff - ESS ecosystem - Battery Storage Drain

Q&A and troubleshooting EVCS
, , , ,
1

Hello community,
Have a query about EVCS scheduled charge options when installed as part of a Victron ecosystem operating in ESS mode self-consumption.

PXL_20250623_203627827
PXL_20250623_2036278271920Ă—2550 187 KB

The auto mode for utilising surplus solar generation during the summer months to charge a car is great, plus manual mode for boosting is useful also.

Have an off-peak grid tariff arrangement, economy 7 which is currently approx 16p/kWh night vs 33p/KW day rate.

In summer months solar PV and battery storage is sufficient to meet general household usage without needing much import, apart from occasional peak demand when a load may exceeds what Multiplus can deliver in ess operation. There is also many days where there lots spare to charge an EV.

However on poor solar days need to be able to charge the car from grid, so best to make use of the off-peak tariff.

If a scheduled EV charge is set e.g. between 1AM to 8AM on the EVCS, my question is how do you prevent the EVCS from draining the battery storage?

Is this possible?

Is there intelligence that can be enabled where if a scheduled charge is set on the EVCS that the multiplus scheduled grid charge would also synchronise with the EVCS scheduled charge?

1 Like
2

Hi,

It depends on your system layout. You could connect the EVCS to ACIN, and then set ESS to power ACIN loads from the battery, when needed - or disable that, when you want to charge from grid.

You could look into Node-Red to automate that setting, kind of a simple logic: “If ev power > 0 and time between 0 and 6, disable battery2acin, else enable battery2acin” (or whatever times are suitable for you)

If you connect the EVCS to ACOUT, there is currently no way to prevent it from battery drain, because loads on ACOUT will always be supported with battery power.